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        <h1>pandas.DataFrame.index</h1>
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        <h2>DataFrame.index</h2>
        <p>The index (row labels) of the DataFrame.</p>
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        <p>DataFrame有行、列组成，每个index代表着DataFrame每行的label</p>
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        <p>London is the most populous city in the United Kingdom, with a metropolitan area of over 9 million inhabitants.</p>
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        <p>gavinsun@qq.com</p>
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